Drilling tool



Oct. 30, 1928.

M. P. HOLMES DRILLING TOOL 2 Sheets-Sheet 1 Filed' March 1'7, 1926 AmA-WMQ Oct. 30, 1928.

M. P. HOLMES DRILLING TOOL Filed March 17, 1926 2 Sheets-Sheet 2 pwA WmPatented Get. 30, 1928.

UNITED STATES PATENT, oF ce,

11033151. HOLMES, or. otnnnmonmnnw nAMPsnInE, lemma TO sU LL IvAN MA:CHINEBY oourrnmr, A;oonromirror: or MASSACHUSETTS.

DRILLING TOOL.

Application filed March 17,1926L Seria1 No. 95,400. I

Ihis inventionrelates to drilling toolsand more particularly to handheld drilling tools of therotary type especially adapted to use withcoal mining machines iii-drilling shot? holes in theicoal during orsubsequent to the cuttingof a kerili therein and preparatory to theshooting of the coal'fron'i the solidl.

In coal miningduring or subsequent to the cutting of a lierf in' the'face of the coal hy the coal cutting machine andipreparatory to i theshooting of the'coal from the solid,

it is the" usual practice to drill a series of shot 110183111 the coal.Explosivesare then ginserted in the shot? holes andthe coal shot sourceoipower and which is of exceed having improved and simplified e. "anddriving means there't ihle transmi.

fromthe solid in the usual rnanncr. In certain instances, the drillingtools for drilling these shot holes are driven independently of the coalmining machine, thereby greatly increasing the installation cost by thenecessity of laying out separate power lines to both the drilling toola-nd the mining machine. These drilling tools are usually selfcontainedmechanisms adapted to be held by the operator during an ope 'ationthereof and driven by separate-air or electric motors and arenecessarily cumbersome and unwieldy to operate, due to theinherent-weight of such motors and their related parts. a A primaryobject of this invention is to provide a drillingtoel especially daptedto use indrillingshot holes in the coal and which is driven directlyfrom the mining machine driving motor, thereby substantially decreasingthe dimensions and v of thetool. Another. object of this inireely inov lbodily in any direction with respect t inexpensive, siii'iple, andcompact rhai A still further ob ect or this invcn 1031 l provide animproved hand held l 11;; tool orf Y LO prov de '2: improved s betweenthe tool. and

These and oil 1' objects ofmy inve on will, however, quently more fullyappear.

the source of po the mining of the coal.

-rot ary drilling tool having a power shaft connected in a socket formedin one ofthe transmissiongears for the cutting mechanism of a'ininingn'iaohine and this shaft-preterably drives the .tlrilling tool throughsuitable controlling "mechanism and a flexihle transmission shaft,herein preferably in the'fi'orm of a Wire rope or cable housed within asuitable flexible metallic covering. V

, In the accompanying drawings I have shown for purposes of illustrationone form whichmy invention'niay assume in practice.

In these drawings, 4

F ig. 1 is'a side elevation of the on ting end of a mining machine withwhich my improved drilling tool associated.

F 2 is a diagrammatic View illustrating the operation of the improved'drillingtool 111 a mine. :Fig. 3 is a central longitudinal sectionaliew through the ii nproved drilling tool.

' Fig. 4 is a'central longitudinal sectional view through a portion ofthe improved transmission means for the drilling tool.

Fig, 5 is a vertical transverse sectional view taken substantially online 5+5 of Fig. l illustratinga portion of the improved con trollingmechanism.

Fig. 6 is a detail view of the driving ratchet mechanism.

In this illustrative construction I have shown 'a drilling tool ofimproved form generally designated 1 operatively connected, through aflexible transmission element 2, to the cuttin endvof a mining machinegenerallyv designated 3. The mining machine Smay iiio chine the typedescrihedin my copending application, Serial No. 6, 177, filed Feb. 2,1925. ills the structure of this mining ma chine does notspeeihoallyenter into my 1nvention, detailed illustration anddescription of the same 1s deemed'unnecessary otherthan .L' 1. J.

to state that an armature shaft 4 of a reversihlemotor, not shown, isprovided and drives through transmission means, to he herein alterdescribedfa usual driving sprocket 5 which cooperates with the usualcutter bit carrying cutter chain 6 to drive the latter in a well knownmanner. As illustrated, the motor shaft l is adapted to have connectedthereto by means of a manually operable gear clutch T a bevel pinion 8which is meshed with a larger bevel gear 9 rotatable on an axisperpendicular to the axis of the motor shaft 1 and this gear 9 isjournaled within suitably spaced alincd hall bearings 10 carried withinthe machine frame. The bevel gear 9 has formed thereon a spur pinion 11which meshes with a larger spur gear 12 journaled on bearings 1?:suitably carried in the machine frame. As shown the gear 12 is adaptedto drive through a manually controlled gear clutch 14:, as is clearlydescribed in my copending application mentioned above, a cutter chaindriving shaft 15. the latter being iournaled at its opposite ends withinalined ball bearings 16. The shaft has keyed thereto at its lower end at17 the cutter chain driving sprocket From the foregoing descripti on itwill be clearly evident that when the clutches 7 and 1% are connected,the cutter chain driving sprocket 5 is adapted to be driven from themining machine motor, butthis driving sprocket 5 may be disconnectedfrom the transmission gearing 8, 9. 11, and 12 at will by means of thegear clutch 14;.

In referring more particularly to the improved construction, that is tothe drilling tool and the driving and controlling connections therefor,it will be observed that disposed within a vertical socket or bore 18formed within the shaft supporting the gears 9 and 11 and securedthereto by a key 19 is a shaft 20. As shown. the upper end of the shaft20 is provided with a flat disk-shaped portion or flange 21 havingformed on the upper plane surface thereof. projecting ratchet teeth 22which are adapted to cooperate with correspondingprojectingratchet teeth23 formed on a circular flange 24' carried at the lower end of a shaft25, the latter being splined. as at 26, in operative sliding relation toa spiral gear 27. arranged coaxially with the spur pinion 11 and havingoppositely projecting hub portions '28 journaled respectively in ballbearings .29 carried within a casing or housing member 30. suitablysecured by bolts 31 to the frame of the mining machine. The casing is,in this instance, composed of two main parts held together by bolts 32and is provided with a depending sleeve portion which forms a supportfor the upper ball bearing 10 in which the gears 9 and 11 are journaled.In accordance with this invention. a coiled spring PA encircles theshaft and is interposed between the flange 2t and the lower hub portionof the spiral gear 27. and this spring normally tends to yieldably holdthe ratchet teeth 2'2 23 in interengagcd relation. To release theengagement of the ratchet teeth 3 an operating lever 35 is provided,secured as by a transverse pin 36 to an actuating rod 37 slidablymounted in a bore 38 formed in a detachable cover plate 53!) secured tothe casing 30. Furthermore, the handle 35 has formed thereon a cam 40which engages a cam surface 41 formed on the upper surface of the coverplate 39. As shown the lower end of the rod 37 is provided with acircular flange 42 which engages an inwardly extending llange til formedon a member a l threadcdl y connected, as at 4:5, to the upper end ofthe shaft 25. From the foregoing description, it will be obvious thatwhen the operator rotates the handle 35 the cam 4.0 rides upwardly onthe cam surface 11, thereby causing longitudinal upward moven'ient ofthe rod 57 and the shaft 2.. consequently releasing the interengagementof the ratchet teeth 22, 23. It is therefore evident that the gear 27may be driven or remain idle at will during running of the transmissiongears 9, 11, and 12 oil the mining machine cutting mechanism. Meshingwith the spiral gear 27 and disposed on an axis at right angles to theaxis of the gear 27 is a spiral gear 46 having secured thereto, as bybolts 4-7, op ')ositel v extending hub portions 48 and 4-9 journaledrespectively in ball bearings 50 suitably carried within bores 51 formedwithin the opposite, ends of the casing 30, closure members and 53closing these bores. Secured within the spiral gear 46 is a series ofclutch disks 54; which are interleaved with a series of clutch diskscarried by a clutch member 56 journalcd at its opposite ends in radialbearings 57 and thrust bearings 58 carried by the hub portions 48 and49. Slidably mounted on the hub portion 4-9 is a clutch applying member5.) having projecting fingers (30 extending through apertures 61 formedin the member 49 and these lingers (it) engage certain of the series ofclutch disks 54, 55. Encircling the hub portion -19 and engaging theactuating member 59 and an adjustable collar (32 is a coiled spring 63.This spring tends to constantly force the clutch disks in. together. For releasing the actuating n'iember 59 is a ship per yoke G l. engaginga radial flange (34 formed on the actuating member. The shipper yoke 64;is pivoted, as at (if). and is secured to a transversely disposed shaft(35 suitably journaled in the casing 30. The outer end of the shaft (35has securml thereto an operating lever 66. It will therefore be evident.that when the lever (36 i swung downwardly the shipper yoke (J lswingsabout its pivot and the clutch actuating member is slid longitudinally,thereby releasing the engagement of the clutch disks and compressing thecoiled spring (13. It will also be obvious that by slipping the clutchdisks 54, the speed of rotation of the drilling tool maybe varied andthat when the cutting tool is overloaded the clutch disks 54, mayautomatically slip,

thereby preventingrbreakage of the parts. Splined asat 67 in operativesliding relation with the clutch member 56 is a rotatable transmissionmember or shaft 68 having formed thereon at its forward end an enlargedsocket portion 69 within which the rear end of a flexible transmissionelement 70, herein preferably in the form of a spirally laid wire ropeorcablej, is suitably rigidly secured preferably by brazing. The element70 is so arranged that application of the relative force to its rear endtends to wind it tighter rather than to unwind it during drilling. Theforward end of the wire rope 70 is likewise rigidly secured within asocket 71 formed withina member 72 secured as by atransverse pin 7 3 toa member 74, the latter being threadedly connected, as at 75, to a tooldriving shaft 7 6. The tooldriving shaft 7 6 is journaled at itsopposite ends in ball bearings 77 of the combined radial and thrust typesuitably carried within a casing 78 of the drilling tool 1. In thisinstance the forward endof the shaft 7 6 has formed integral there witha socket 78 which is adapted to receive the shank of the usual augercutting tool 79. It will herein be observed that-siutably secured. atone end within a bell-mouthed guide member or adapter 80, threadedlyconnected as at 81 to the cover member 52, isa tubular metallic armor orcovering element 82 for the cable 7 0, herein preferably of flexibly'ointed structure. The opposite end'of the exible covering member 82 issuitably secured within a bell-mouthed guiding member or adapter 83, thelatter being threadedly connected as at 84 to the casing 78 of thedrilling tool. As illustrated, the casing 78 of the drilling tool isprovided, with lateral lugs or ears 85 to which are ivotallyconnected asat 86 oppositely extending lateral handles 87, the latter having lugs orstop members 88 wh ch are adapted to engage the sides of the'casing 78when the handles are in extended position. The handles may be foldedinwardly against the sides of the casing .78, as indicated by dottedlines in 3, when the tool is not in In theuse of my improved drillingtool, it will herein be noted that after the kerf has been cut in thecoal by the mining machine,

. the clutch 14 is thrown out by the operator,

disconnecting the cutter chain drive and the, machine is then retractedfrom the face in a Suitable manner to the" position shown in Fig. 2. Theoperator then manipulates the handle 35, thereby causing the ratchetteeth 22, 23 to be forced into operative driving engagement by means ofacoiled spring 34, thus causing the spiral gears 2fZand 46 andconsequently the flexible transmission element 70 to be rotated, thesplined connection 67 permitting slidingmovement between the transmission element 70 and, the clutch member 56as the wire ropel70 alternatelyshortens and,

lengthens under load. This alternateshortening and lengthening of theWire rope transmits a vibrating action to the auger cutting bit which isfound to be advantageous under certain conditions. It will also be notedthat during. this operation the frictional engagement between the clutchdisks 54, 55 may be interrupted or varied at will upon suitablemanipulation of the lever 66. The operator 7 then grasps the handles 87and the auger cutting tool is suitably positioned'with re-.

herein also be noted that the ratchet teeth 22, 23 automatically preventreverse drive of the spiral gears 27 and 46 upon reversal of'thedrivlngmotor, consequently preventing the uncoill ng and the resultantdamaging of the wire rope 70 and its related. parts. It will also be,noted that if desired, the shot holes operation of the miningmachinethereby de- CIGEISIIIO the time consumed n breaking down theco. Theseand other operations of the may bedrilled in the coalduring the cuttingimproved mechanism will be clearly apparent to those skilled in the art.7

As a result of this invention it will-benoted that an improved drillingtool is provided which is dirven from the transmission means of thecutting mechanism of, the mining machine, thereby reducing thedimensions and weight ofthe drilling toolto a minimum. It

. will further be noted that an improved rotary drilling tool isprovided which is of ex? ceedingly simple, inexpensive, -and compactcharacter. These and other advantagesof y invention will beclearlyapparent tothose skilled in the art. r

While I have in this application specifically described one form whichmy invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodiedin various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: v r

1. In a drilling tool, a power driving element adapted to be driven inopposite directions, cooperating gearing driven thereby, mechanismconnecting said gearing with said driving element, said mechanism beingautomatically operative to prevent driving of said gearing when saiddriving element is driven in one direction, a transmission shaft, aclutch connecting said shaft withsaid gearing, a flexible transmissionshaft driven by llu said shaft, and a drilling tool driven by saidflexible transmission shaft.

2. In a drilling tool, a power driving element, cooperating gearingdriven thereby, a ratchet mechanism connecting said gearing with saiddriving element, a transmission shaft, a clutch connecting said gearingwith said shaft, a flexible transmission shaft driven by said shaft, anda drilling tool driven by said flexible transmission shaft.

3. In a drilling tool, a power driving element, cooperating gearingdriven thereby, a ratchet mechanism for connecting said gearing withsaid driving element, means for rendering said ratchet mechanisminoperative, a transn'iission shaft, a clutch conneetii'ig said gearingwith said transmission shaft, a flexible transmission shaft driven bysaid shaft, and a drilling tool driven by said flexible transmissionshaft.

4. In a drilling tool, a power driving element, cooperating gearingdriven thereby, a ratchet mechanism for connecting said gearing withsaid driving element, manually operable cam means for rendering saidratchet mechanism inoperative, a transmission shaft. a clutch connectingsaid gearing with said transn'iission shaft, a flexible transmissionelement driven by said shaft, and a drilling tool driven by saidtransmission element.

5. In a drilling tool, a power driving element, cooperating gearingdriven thereby, a clutch connecting said gearing with said drivingelement, a transmission shaft eonnectible in operative sliding relationwith one of said gears, a clutch connecting said gearing with saidshaft, a flexible transmission element driven by said shaft, and adrilling tool driven by said transmission element.

6. In a drilling tool, a power driving element rotatable in oppositedirections, coopcrating gearing driven thereby, a ratchet mechanismreleasable at will during driving thereof connecting said gearing withsaid driving element, said ratchet mechanism being adapted to slip whensaid driving element is rotated in one direction, a transmission shaft,a clutch connecting said gearing with said shaft, a flexibletransmission elelnent driven by said shaft and adapted to rotate in onlyone direction, and a drilling tool driven by said transmission element.

7. In a drilling tool, a power driving elcment rotatable in oppositedirections, eoopcrating gearing driven thereby, a ratchet mechanismreleasable at will during driving thereof for connecting said gearingwith raid driving element, said ratchet mechanism being adapted to slipwhen said driving element is rotated in one direction, a transmissionshaft, a clutch connecting said gearing with said shaft, a transmissionelement driven by said shaft and adapted to rotate in only onedirection, and a drilling tool driven by said transmission element.

8. In a drilling tool, a power driving element rotatable in oppositedirections, cooperating gearing driven thereby, a atchet mechanism forconnecting said gearing with said driving element, said ratchetmechanism being adapted to slip when said driving element is rotated inone direction, means operable at will during driving of said ratchetmechanism for rendering said ratchet mechanism inoperative, atransmission shaft, a clutch conncctil'lg said gearin; with said shaft,a transmission elcment driven by said shaftand adapted to rotate in onlyone di rection, and a drilling tool driven by said transmission element.

9. In a drilling tool, a power driving element rotatable in oppositedirections, cooperating gearing driven thereby, a ratchet mechanism forcoi'inecting said gearing with said driving element, said ratchetmchanism being adapted to slip when said driving element is rotated inone direction, means operable at will during driving of said ratchetmechanism for rtaidering said ratchet 1nechanism inoperative, a transmisimi shaft, a clutch connecting said gearing with said shaft, a flexibletransmission element driven by said shaft and adapted to rotate in onlyone direction, and a drilling tool driven by said transmission element.

10. In a drilling tool, a power driving element rotatable in oppositedirections, cooperating gearing driven thereby, a ratchet mechanism forconnecting said gearing with said driving element, said ratchetmechanism being adapted to slip when said driving element is rotated inone direction, manually operable cam means for rendering said ratchetmechanism inoperative, a transmission shaft a clutch connecting saidgearing with said shaft, :1 transmissionclement driven by said shaft,and a drilling tool driven by said transmission element.

11. In a drilling tool, a power driving element rotatable in oppositedirections, eooperating gearing driven thereby, a ratchet mechanism forconnecting said gearing with said driving element, said ratchetmechanism being adapted to slip when said driving element driven in onedirection, resilient means for maintaining said ratchet mechanism inoperative position, manually controllable means operable at will duringdriving of said ratchet mechanisn'i for (wercoming said resilient meansto render said ratchet mechanism inoperative, a transmission shaft, a,clutch connecting said gearing with said shaft, a transmission clementdriven by said shaft and adapted to rotate in only one direction, and adrilling tool driven by said transmission element.

1.2. In a drilling tool, a driving element, spiral gearing driventhereby. a ratchet mechanism for connecting said driving element withone of the gears of said gearing, said mechanism comprising cooperatingratchet elements and a spring for forcing said elements together,manually operable cam means for separating said ratchet elements torender said ratchet mechanism inoperative,-a transmission shaft, afriction clutch for connecting said gearing tosaid shaft, a flexibletransmis sion element driven by said shaft, and a drilling tool driven"said transmission element.

13. In a drilling tool, a power driven element rotatable in oppositedirections, spiral gearing driven thereby, a ratchet mechanism forconnecting said driving element with one of the gears of said gearing,said ratchet mechanism being adapted to slip when said driving elementis rotated in one direction and comprising cooperating ratchet elementsand a spring for forcing said elements together, manually operable cammeans for separatmg said ratchet elements to render said ratchetmechanism inoperative, a transmission shaft,

a friction clutch for connecting said gearing to said shaft, a flexibletransmission element driven by said shaft, and a drilling tool driven bysaid transmission element.

14. In a drilling tool, a power driving element, cooperating spiralgears driven there by, a ratchet mechanism for connecting one ofsaidgears with said driving element, said ratchet mechanism comprisingcooperating ratchet elements, a spring for forcing said elementstogether, one of said elements having operative sliding relation withone of said gears, a transmission shaft, a clutch for connecting saidgearing to said shaft, arflexible transmission element driven by saidshaft, and a drilling tool driven by said transmission element. r

15. In a drilling tool, a power driving element, cooperating spiralgears driven thereby, a ratchet mechanism for connecting one of saidgears with said driving element, said ratchet mechanism comprisingcooperating ratchet elements, a spring for forcing said elementstogether, one of said elements having operative sliding relation withone of said gears, means for rendering said ratchet mechanisminoperative, a transmission shaft, a clutch for'connecting said gearingto said shaft, a flexibletransmission element driven by said shaft, anda drilling tool driven by said transmission element. a

16. In a drilling tool, a power driving element, cooperating spiralgears driven thereby, a ratchet mechanism for connecting one of saidgears with said driving element, said ratchet mechanism comprisingcooperating ratchet elements, a spring for forcing said elementstogether, one of said elements having operative sliding relation withone, of said gears, manually operable cam means for rendering saidratchet mechanism inoperative, a transmission shaft, .a clutch forconnecting said gearing to said shaft, 'a flexible transmission elementdriven by said shaft, and a drilling tool driven by said transmissionelement.

17 In a drilling tool, a power driving elc ment rotatable in oppositedirections, spiral gearing driven thereby, a ratchet mechanism forconnecting one of the gears of said gearing with said driving element,said ratchet mechanism being adapted to slip when said driving elementis rotated inone direction and comprising cooperating ratchet elements,a spring for forcingsaid ratchet elements together, one of said elementshaving operative sliding relation with one of said gears, a transmissionshaft, a friction clutch for connecting said shaft with said gearing, aflexible transmission element driven by said shaft, and a drilling tooldriven by said transmission element.

18. In a drilling tool, a power driving element rotatable in oppositedirections, spiral gearing driven thereby, a ratchet mechanism forconnecting one of the gears of said gearing with said driving element,said ratchet mechanism being adapted to slip when said driving elementis rotated in one direction and comprising cooperating ratchet elements,a spring for forcing said ratchet elements together, one of saidelements having operative sliding relation with one of said gears, meansfor rendering said ratchet mechanism inoperative including means forforcing said ratchet elements apart, a transmission shaft, a frictionclutch for connecting saidshaft with said gearing, a flexibletransmission element driven by said shaft, and a drilling tool driven bysaid transmission element.

19. In a drilling tool, a power driving ele ment, cooperating gearingdriven thereby, mechanism connecting said gearing with said drivingelement, a reciprocable transmission shaft, a clutch connecting saidgearing with said shaft, a flexible transmission shaft fixed to anddriven by said shaft, and a drilling tool driven by said flexibletransmission shaft. In testimony whereof I afiix my signature.

MORRIS P. HOLMES.

